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Old 06/05/2008, 03:48 PM   #1 (permalink)
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Overfilled AC, how to discharge?

Its hot over here, my AC wasn't as cold as it use to be, and I was desperate so I pulled out one can of R134 out of my garage and hooked it up to my car. I filled it up, everythign seemed perfect (had AC on high while car running) and it was actually really cold. I was all happy....only lasted a minute though. As I went to drive and pick up my bro from school I heard this insane weird ass noise and I shut off my AC. Now everytime I turn it on it'll be cold for a little while then it would just be cool. Im pretty sure I overfilled the AC lines slightly since I didn't have a gauge on me, only the hose. Wheres the valve to discharge some freon?
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Old 06/05/2008, 04:47 PM   #2 (permalink)
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It on the passenger side. The metal/aluminum lines that run somewhere by the passenger motor mount there is a line with a black cap. All you do is get a screw driver, take off the cap, and release the gas. There is a release / charge valve there, press on it with a screw driver. Be sure you do it in a ventilated area, and you cover the hand holding the screw driver in a glove or rag. Wear some eye protection. Then get a gauge and measure that you have proper operating pressure.
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Old 06/05/2008, 06:38 PM   #3 (permalink)
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A/C work is always fun!
I remember back in the day, I was putting an R-12 alternative in my truck I had at the time and read the lovely warning on the back of the can, that simply stated, "Inhalation of product may cause instantaneous death without warning."
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Old 06/05/2008, 07:49 PM   #4 (permalink)
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It on the passenger side. The metal/aluminum lines that run somewhere by the passenger motor mount there is a line with a black cap. All you do is get a screw driver, take off the cap, and release the gas. There is a release / charge valve there, press on it with a screw driver. Be sure you do it in a ventilated area, and you cover the hand holding the screw driver in a glove or rag. Wear some eye protection. Then get a gauge and measure that you have proper operating pressure.
Which one, the High or Low? Im guessing Low since you said the charge valve? Also should I do this with the AC running or off?
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Old 06/05/2008, 09:32 PM   #5 (permalink)
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Turn the a/c off!!!
I would let the car sit a while and cool off. The pressures will equalize.

When you are over charged pressure on the high side can get over 300 lbs. so please be carefull.

If you were to let the high side loose on your hand it would burn you pretty bad.

Next time just add in small amounts and watch a temp gauge stuck in the center dash vent. Let the gauge have time to adjust. I usually try to get the temp around 45 out of the center vent and then go drive it at a decent speed. Within 5 minutes with ram air across the condensor you should get near 40 deg. You will be able to watch it swing back and fourth from like 38 - 40 as the compressor kicks on and off.
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Old 06/05/2008, 09:32 PM   #6 (permalink)
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Low Side BTW
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Old 06/05/2008, 10:56 PM   #7 (permalink)
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Well I let out some freon from the Low side with the car off, it came out as a gas stage. Then I turned on the car and let out a little more until I started seeing small bubbles/liquid freon spitting out and everythings working perfect. Thanks for the help guys, + e-rep for both
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Old 06/06/2008, 10:26 AM   #8 (permalink)
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Quote:
Originally Posted by TSI27 View Post
Well I let out some freon from the Low side with the car off, it came out as a gas stage. Then I turned on the car and let out a little more until I started seeing small bubbles/liquid freon spitting out and everythings working perfect. Thanks for the help guys, + e-rep for both
It is not liquid freon that you saw. Its actually oil the lubes the A/C system and mainly the pump. So don't let a lot of it out. Otherwise you might get premature failure. But I'm sure you let mostly the gas out.
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